A quantum cascade laser based on a three well active module and emitting at 3 THz is demonstrated. The optical transition is vertical in real space and localized in an Al0.03Ga0.97As quantum well. Maximum operating temperature of 123 K in pulsed mode is reported, with threshold current densities as low as 110A/cm2 at 10 K and 175A/cm2 at 100 K. High slope efficiency values testify the good internal quantum efficiency of the structure.

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